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The role of crystal phase in determining photocatalytic activity of nitrogen doped TiO2

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Abstract.
Two series of nitrogen doped TiO2 samples with different ratios of anatase to rutile phases were prepared
by milling the mixture of P25 TiO2 and C6H12N4 in air and gaseous NH3 atmosphere, respectively.
Compared to air, NH3 atmosphere plays an important role in delaying the crystallite transformation from
anatase to rutile in the mechanochemical reaction of TiO2 and C6H12N4. In contrast to the previously
reported results for pure TiO2, it is found that nitrogen doped TiO2 with higher content of rutile phase
demonstrates higher photocatalytic activity in photodegrading pollutant Rhodamine B under both UV
light and visible light irradiation (λ > 420 nm), and the amount of the surface-adsorbed water and
hydroxyl groups on nitrogen doped TiO2 have little correlations with their crystallite phases (anatase or
rutile) and photocatalytic activity. The more abundant surface states characterized by photoluminescence
spectroscopy together with the lowered valence band maximum of rutile TiO2 by nitrogen doping are
considered as the key factors for the higher activity of nitrogen doped TiO2 with higher content of rutile
phase.

Keywords: TiO2, Anatase, Rutile, Nitrogen doping, Crystal phase

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 329 (2009) 331–338

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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